Serotonergic () or
serotoninergic () means "pertaining to or affecting
serotonin". Serotonin is a
neurotransmitter. A
synapse is serotonergic if it uses serotonin as its neurotransmitter. A serotonergic neuron
produces serotonin. A substance is serotonergic if it produces its effects via interactions with the serotonin system, such as by stimulating or blocking
neurotransmission.